QMDI 46-4 Classic: Feeder Paper Pile doesn't stop, always goes up

Hello everybody.
The problem is that suddenly, between one job and the following, the feeder pile continuosly goes up. It doesn't stop.
I'ver tried the Special Functions, and noticed that the reading of the oscilator rising lever on 11B2 sensor is the opposite respect what written on manual.... when there is metal, the panel indicate "1", and when there isn't no metal, indicates "0".... with those readings, the machines doesn't know when to stop raising feeder pile, I think.
Could be only the magnetic sensor 11B2, or something more?
To test something.. I made the adjusment for raising pile, with the 4.1 spacer, etc.... but no good results.
Thanks in advance,
José Carlos

 

SOLVED!
The pile height pin was out of position.... Just put everything ok, and... the readings of 11B2 are OK.
I send a photo of the PIN.
Thanks all!